薄膜表面等离子体光催化剂Ag@AgBr/CNT/Ni的制备和性能  

Preparation and Properties of Plasma Photocatalyst Ag@AgBr/CNT/Ni Thin Films

作　　者：李爱昌[1] 赵娣[1] 卢艳红[1] 杨晓静 王瑶 刘建新 LI Ai-Chang;ZHAO Di;LU Yan-Hong;YANG Xiao-Jing;WANG Yao;LIU Jian-Xin(Faculty of Chemistry and Material Science,Langfang Teachers College,Langfang,Heibei 065000,China)

机构地区：[1]廊坊师范学院化学与材料科学学院,廊坊065000

出　　处：《无机化学学报》2018年第11期2009-2018,共10页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.51502125);河北省自然科学基金(No.E2016408035)资助项目

摘　　要：用复合电沉积技术制备了Ag@AgBr/CNT/Ni表面等离子体薄膜催化剂,以扫描电镜(SEM)、X射线衍射(XRD)、拉曼光谱(Raman Spectra)、X射线光电子能谱(XPS)和紫外-可见漫反射光谱(UV-Vis DRS)对薄膜的表面形貌、晶体结构、化学组成和光谱特性进行了表征,在可见光照射下,用罗丹明B(RhB)作为模拟污染物对薄膜的光催化性质和稳定性进行测定,采用测定薄膜电化学阻抗谱(EIS)和向反应系统中加入活性物种捕获剂的方法对薄膜光催化机制进行探索。结果表明:最优工艺下制备的Ag@AgBr/CNT/Ni薄膜是由少量碳纳米管(CNT)和表面沉积纳米Ag粒子的AgBr晶体构成的复合薄膜。薄膜具有突出的表面等离子体共振效应、优异的光催化活性和良好的催化稳定性。光催化罗丹明B 20 min,Ag@AgBr/CNT/Ni薄膜的降解率是Ag@AgBr/Ni薄膜的1.32倍,是P25 TiO_2/ITO多孔薄膜的21.6倍。在保持光催化性能基本不变的前提下可循环使用5次。CNT的存在使薄膜电荷传导性能和光催化还原溶解氧的性能大幅增加,是所制薄膜相对于Ag@AgBr/Ni薄膜光催化性能提高的主要原因。提出了薄膜光催化罗丹明B的反应机理。Ag@AgBr/CNT/Ni thin films were prepared by composite electroplating.The surface morphology,phase structure,chemical composition and optical characteristics of the thin film were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),Raman spectrum,X-ray photoelectron spectroscopy(XPS)and ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS),respectively.Its photocatalytic properties and stability were evaluated with rhodamine B(RhB)as a model compound under visible light.By measuring the electrochemical impedance spectroscopy(EIS)and adding active species trapping agents to the reaction system,the mechanism of photocatalytic degradation of the film was explored.The results show that the Ag@AgBr/CNT/Ni thin film prepared under the optimized conditions is composed of a small amount of carbon nanotubes(CNT)and AgBr crystals coated with nano-Ag particles,which have a significant surface plasmon resonance(SPR)effect.The thin film exhibits a maximum photocatalytic activity and a superior photocatalytic stability to decompose RhB.The photodegradation rate(92.7%)of the Ag@AgBr/CNT/Ni thin film under visible light irradiation 20 min is 1.32 times greater than that of Ag@AgBr/Ni thin film,and 21.6 times greater than that of P25 TiO2/ITO thin film.The photocatalytic activity kept mostly unchanged after five recycled experiments.The existence of CNT greatly increases the charge conductivity and the photocatalytic reduction property for dissolved oxygen of the Ag@AgBr/CNT/Ni thin film,which is the main reason for the improvement of the photocatalytic properties of the film.In addition,the photocatalytic reaction mechanism of the film for RhB under visible light irradiation was also discussed.

关 键 词：Ag@AgBr/CNT/Ni薄膜 表面等离子体共振 复合电沉积 光催化 反应机理 

分 类 号：O611[理学—无机化学] O643[理学—化学]